In Europe there are two solutions to achieve the necessary ductility of bolt/nut/washer assemblies: system HR and HV. Both systems are well proved, however it is important to avoid mixing up the components of both systems. For this reason the systems are standardized in one single part and the marking of the components of the same system is uniform (Table 1). Preloaded bolted assemblies are very sensitive to differencies in manufacture and lubrification; it is important that the assembly is supplied by one manufacturer who is always responsible for the function of the assembly and the coating. It is necessary the CE marking on packages/boxes and/or the accompanying commercial documents. In addition to individual components suitability, the norm also supplies a procedure how to achieve the right preload for the assembly functionality.

Bolts - dimensions in mm - source DIN 14399-3
Publication date: 04/2015
d thread size	P	b l<=125	b l>125 <=200	b l>200	k max .	k min	ds min÷max	e min.	s nom/max	s min	r
M 12	1.75	30	-	-	7.95	7.05	11.3÷12.7	23.91	22	21.16	1.2
M 14
M 16
M 18
M 20
M 22
M 24
M 27
M 30
M 36

Nuts - dimensions in mm - source DIN 14399-3
Publication date: 04/2015
d thread size	Pitch	dw min	s nom	e min	m max	m min	c max
M 12	1.75	20.1	22	23.91	10.8	10.37	0.8
M 14
M 16
M 18
M 20
M 22
M 24
M 27
M 30
M 36

Table 1 - Systems of bolt/nut/washer assemblies
	Bolt/nut/washer assembly System HR -  Garniture aus Schrauben/Muttern und Scheiben System HR  -  Assieme bullone/dado/rondella sistema HR	Bolt/nut/washer assembly System HV  -  Garniture aus Schrauben/Muttern und Scheiben System HV - Assieme bullone/dado/rondella sistema HV
General requirements Allgemeine Anforderungen Requisiti generali	EN 14399-1
Bolt/nut assembly - Garnitur aus Schraube und Mutter - assieme bullone/dado	EN 14399-3	EN 14399-4
Marking - Kennzeichnung - Marcatura
Property classes - Festigekeitklasse - Classi di resistenza
Washers - Scheiben - Rondelle
Marking - Kennzeichnung - Marcatura
Suitability test for preloading - Eignungsprüfung für das Vorspannen - Prova di idoneità all'impiego

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH,Burggrafenstraße 6, 10787 Berlin, Germany.
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